Writing>Identifying Sentence Errors

　　The following sentence contains either a single error or no error at all. If the sentence contains an error， select the one underlined part that must be changed to make the sentence correct.If the sentence contains no error， select choice E.

　　Salt is valued not only because of its properties as a condiment and preservative， but it is essential to the health of humans and animals. No error

　　(A) is valued

　　(B) as a condiment

　　(C) but

　　(D) essential to

　　(E) No error

　　Explanation

　　The error in this sentence occurs at (C)， where there is an improper idiom. In order to appropriately complete the correlative construction， the word “also” must be inserted after the conjunction “but.” This results in the correlative construction “not only … but also.” In addition， what follows “not only” must be grammatically parallel to what follows “but also，” so the word “but” should be changed to “but also because.”

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（编辑：马菲）